Remove Plot Margins in ggplot2

Question

I\'m trying to produce a png chart using ggplot2 and ggsave (with Cairo) in R. I\'m having an issue with customising the theme to remove margins.

Currently I\'m usin

Answer 1

According to the source code, you also need to set the labels to NULL,

last_plot() + labs(x=NULL, y=NULL)

alternatively, set unit(-0.5, "line") for the bottom and left margins.